21152334325431 has 16 divisors (see below), whose sum is σ = 28712753481600. Its totient is φ = 13847262729888.

The previous prime is 21152334325391. The next prime is 21152334325433. The reversal of 21152334325431 is 13452343325112.

It is a happy number.

It is not a de Polignac number, because 21152334325431 - 2³¹ = 21150186841783 is a prime.

It is a super-2 number, since 2×21152334325431² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21152334325431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152334325433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65718576 + ... + 66039653.

It is an arithmetic number, because the mean of its divisors is an integer number (1794547092600).

Almost surely, 2^{21152334325431} is an apocalyptic number.

21152334325431 is a deficient number, since it is larger than the sum of its proper divisors (7560419156169).

21152334325431 is a wasteful number, since it uses less digits than its factorization.

21152334325431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131759198.

The product of its digits is 259200, while the sum is 39.

The spelling of 21152334325431 in words is "twenty-one trillion, one hundred fifty-two billion, three hundred thirty-four million, three hundred twenty-five thousand, four hundred thirty-one".